Nižný Komárnik (Hungarian: Alsókomárnok) is a village and municipality in Svidník District in the Prešov Region of north-eastern Slovakia.

In historical records the village was first mentioned in 1618.

The municipality lies at an altitude of 370 metres and covers an area of 12.381 km. It has a population of about 148 people.

• Media related to Nižný Komárnik at Wikimedia Commons
• Official website
• https://web.archive.org/web/20070513023228/http://www.statistics.sk/mosmis/eng/run.html